---- Changes made from version 2.90 to 3.00: -Implemented support for speed zones. The user cannot view or edit on the device, but speed zones can be sent from Garmin Training Center or Garmin Connect and then used in workouts. -Fixed various issues with workouts showing wrong units in steps. -Added new data fields: Vertical Speed - 30 second average, 3 second power, 30 second power, %FTP power and max speed. -Fixed issue with GPS taking precedence over GSC10 for speed/distance even indoors ----

Cool. Iv'e got both and 310 and a 500. I'm going to test out the 310 and see if I can do without the 500 and sell it. ------------------------------ "Unless you have a ... GF who might put out that night and that night only ... skip it and race." - AndyPants 3-15-2007

Sweet!!!! My first powertap setup will arrive Monday from wheelbuilder! I got the Pro+ with the DTswiss RR585 set on the way . . . already had the 310xt and though the lack of average gave me reservations for not getting a dedicated power computer, looks like lady luck has smiled !

As someone that's new to power what's better, the 3s or 30s rolling average. Which should I have displayed during my rides. ------------------------------ "Unless you have a ... GF who might put out that night and that night only ... skip it and race." - AndyPants 3-15-2007

whichever one works best for what you are doing. For flat coarses the 30s will probably be fine but if there are rollers/hills you may want 3s to make sure you don't spike too much. Maybe havec the 3s & 30s at the same time?

To consolidate/add to/clarify some of the above, the main 500 advantages: -Smaller/lighter/more aero (cough) -Less orange -Slightly bigger screen and more data fields per screen -Choice of Zero Averaging for Power and Cadence (note: this is only for what's *displayed* on the unit - they all *record* exactly the same data) -More accurate elevation (barometric altimeter) -Temperature

I think Zero Averaging is probably the most important of those, with the data fields per screen being second. Although neither are a huge deal in my experience.

Correct - Zero Averaging is OFF and can't be configured (i.e. zeros are excluded – meaning your averages don't creep down when you are coasting - so your numbers will be artificially higher as they only include times when you are pedaling).

I think Zero Averaging is probably the most important of those, with the data fields per screen being second. Although neither are a huge deal in my experience.

so as i understand 310 doesn't give you the option to do zero averaging. and its off is that correct?

thanks that is what i thought, that is what always screws me up....that was the one reason i was going to the 500....but with the 3 sec and 30 sec averaging i will do my best to manage until i sell the pt and buy quarq.